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Note 9 - Derivative Financial Instruments (Detail) - Summary of the effects of commodity derivative instruments on the condensed consolidated statements of operations and comprehensive income (loss): (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Increase (decrease) in fair value of derivatives included in other comprehensive income (effective portion) | $ 231 | $ (223)
Realized gain (loss) included in cost of revenues (effective portion) | $ (66) | $ (111)

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration